Assuming you’re using the modular sensors library, the 2 minute reading on the start-up was a feature that was supposed to help with debugging. The idea was that right after deploying a station you’d want to make sure it was working so you’d want frequent measurements. I took it out in the most recent release because nearly everyone was confused by it and thought there must be a bug.
Between versions ~0.6.6 and ~0.11.5 I’d additionally mistakenly set the internal sample count to an 8-bit instead of 16 bit integer, which was causing the sample count to roll over at 256 samples and re-enter the start-up interval.
So, I think updating your library should make it work the way you expect. Please let me know if it doesn’t!